Question

我的程序似乎工作得很好，但是当我尝试调整组件大小时，我不时收到“IllegalStateExceptions：RunnableQueue未启动或已退出”。我已将documentState设置为ALWAYS_DYNAMIC，我已经读过你应该使用JSVGCanvas的UpdateManager并调用invokelater（）。我知道它可以在第一次之后使用

gvtBuildCompleted(GVTTreeBuilderEvent e)

被调用，所以我在使用它之前检查它是否正在运行，但我仍然得到异常。一个线程反复调用以下方法，似乎导致异常：

private void updateDomTree(final SVGComponent component, final Document doc)
{
if(component.getSvgCanvas().getUpdateManager() != null && component.getSvgCanvas().getUpdateManager().isRunning())
{
    component.getSvgCanvas().getUpdateManager().getUpdateRunnableQueue().invokeLater(new Runnable() 
    {
        public void run() 
        {
            final Node newNode = doc.getChildNodes().item(0).getFirstChild();
            //could be easier to get this value, but ... it works.
            String newNodeId = newNode.getAttributes().getNamedItem("id").getFirstChild().getNodeValue();

            NodeList nodes = component.getSvgDocument().getDocumentElement().getChildNodes();
            Node updateNode = findElementById(nodes, newNodeId);
            resizeComponent(component, doc);
            component.getSvgCanvas().getSVGDocument().adoptNode(newNode);
            component.getSvgCanvas().getSVGDocument().getDocumentElement().replaceChild(newNode, updateNode);
            component.refreshSVGCanvas();
        }
    });
}
}

实际调整大小在这里完成：

protected void resizeComponent(SVGComponent component, Document doc)
{
    Element svgRoot = doc.getDocumentElement();
    final int svgWidth = Integer.parseInt(svgRoot.getAttribute("width"));
    final int svgHeight = Integer.parseInt(svgRoot.getAttribute("height"));
    String[] viewBox = svgRoot.getAttribute("viewBox").split(" ");
    int viewBoxLeft = Integer.parseInt(viewBox[0]);
    int viewBoxTop = Integer.parseInt(viewBox[1]);
    final float factor = component.getScaleFactor();
    String[] viewBoxOld = component.getSvgDocument().getDocumentElement().getAttribute("viewBox").split(" ");
    int viewBoxLeftOld = Integer.parseInt(viewBoxOld[0]);
    int viewBoxTopOld = Integer.parseInt(viewBoxOld[1]);
    int xDiff = (int) ((viewBoxLeftOld - viewBoxLeft)*factor);
    int yDiff = (int) ((viewBoxTopOld - viewBoxTop)*factor);

    if ( viewBoxLeftOld != viewBoxLeft ) //If there is additional content left
    {
        component.setLocation(component.getLocation().x - xDiff, component.getLocation().y);
    }
    if ( viewBoxTopOld != viewBoxTop ) //If there is additional content right)
    {
        component.setLocation(component.getLocation().x, component.getLocation().y - yDiff);
    }

    component.getSvgDocument().getDocumentElement().setAttribute("width",""+svgWidth);
    component.getSvgDocument().getDocumentElement().setAttribute("height",""+svgHeight);
    component.getSvgDocument().getDocumentElement().setAttribute("viewBox", ""+viewBoxLeft+" "+viewBoxTop+" "+svgWidth+" "+svgHeight);
    component.setSize((int)(svgWidth*factor),(int)(svgHeight*factor));
}

方法

refreshJSVGCanvas()

呼叫

JSVGCanvas.setDocument(Document);
JSVGCanvas.setSize(int, int);

这是完整的堆栈跟踪：

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: RunnableQueue not started or has exited
at org.apache.batik.util.RunnableQueue.invokeLater(RunnableQueue.java:277)
at org.apache.batik.swing.svg.AbstractJSVGComponent.updateRenderingTransform(AbstractJSVGComponent.java:1057)
at org.apache.batik.swing.gvt.AbstractJGVTComponent$1.componentResized(AbstractJGVTComponent.java:237)
at java.awt.AWTEventMulticaster.componentResized(Unknown Source)
at java.awt.Component.processComponentEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

先谢谢，我到处搜索并尝试了很多，但找不到解决方案。

编辑：这是实际抛出Exception的Batik的invokeLater-Method：

public void invokeLater(Runnable r) {
    if (runnableQueueThread == null) {
        throw new IllegalStateException
            ("RunnableQueue not started or has exited");
    }
    synchronized (list) {
        list.push(new Link(r));
        list.notify();
    }
}

runnableQueueThrad在该类的'run（） - Method中设置，并在结尾处设置为null。所以我想我必须做某种同步。

Answer 1

危险的猜测，“public void run（）”代码不应该在另一个方法内，并且实际上是一个线程类/接口对象，所谓的构造函数（实际上是接口版本）。

将其移除到自己的类（例如嵌套子类以保留范围）并在类上实现“thread runnable”接口，以在其中放置“run（）”方法以供使用。

堆栈跟踪说run方法不可用，因为它实际上没有这样的方法（或者至少没有正确声明），所以它处于“非法状态”。

调整包含JSVGCanvas的JComponent的大小时，Batik IllegalStateException

1 个答案: